# IIT JEE Advanced & Mains Physics 2020 – 2021 , 2022 : Electricity : Rank file / expected questions : VI

IIT JEE Advanced & Mains Physics 2020 – 2021 : Electricity : Rank file / expected questions / Physicsmynd Elite Series  /  Page  VI

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46 – 47 ] A  cylindrical coaxial capacitor having an inner and outer conductors of radius a  and b respectively , is charged to a voltage V . It’s  dielectric constant K(r) of it’s dielectric  varies with it’s cylindrical radius r . Then –

Find the radial dependence of it’s dielectric constant.

47 ] In the above question ,the electric field E(r) is given by –

A ]

B ]

C ]

D ]

48 ] A system consists of three point charges – 3nC , 2nC and 5nC , at  locations  (0, 0, 0), (0, 0, 1), and (1, 0, 0), respectively.Then the energy of this system is –

A ]  W nJ

B ]  W nJ

C ]  W nJ

D ]  W nJ

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49 – 50 ] A charge Q is equally divided between three identical tiny spheres of mass m which are suspended by threads of negligible masses and equal length l from a common point. If they come to equilibrium at the corners of a horizontal equilateral triangle whose sides are d ,then  is proportional to –

A ]

B ]

C ]

D ]

50 ] In the above arrangement , find Q ?

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51 – 54 ] The figure below shows a charged ring of radius R , into the center of which , an  electron e is brought in through a distance x .  Questions 51 – 54 are based on this –

51] The acceleration experienced by the electron is proportional to –

A ]

B ]

C ]

D ]

52 ] At what distance from the center of the ring is the electric field maximum ?

53 ] Does the electron experience SHM [ simple harmonic motion ] ?

54 ] If it experiences SHM ,then find the tension , T , acting on the electron ?